pinctrl: canaan: k230: add NULL check in DT parse

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: pinctrl: canaan: k230: add NULL check in DT parse Add a NULL check for the return value of of_get_property() when retrieving the "pinmux" property in the group parser. This avoids a potential NULL pointer dereference if the property is missing from the device tree node. Also fix a typo ("sintenel") in the device ID match table comment, correcting it to "sentinel".

References

• https://git.kernel.org/stable/c/b5ae84aeff60b8819e8568ff0c57590caed9e6d3
• https://git.kernel.org/stable/c/5d324b262c0ff256b8d603596574d66267b6394f
• https://git.kernel.org/stable/c/65bd0be486390fc12a84eafaad78758c5e5a55e6